Publications


THE RELATION BETWEEN GAS DENSITY AND VELOCITY POWER SPECTRA IN GALAXY CLUSTERS: QUALITATIVE TREATMENT AND COSMOLOGICAL SIMULATIONS

ASTROPHYSICAL JOURNAL LETTERS 788 (2014) ARTN L13

I Zhuravleva, EM Churazov, AA Schekochihin, ET Lau, D Nagai, M Gaspari, SW Allen, K Nelson, IJ Parrish


Intrinsic momentum transport in up-down asymmetric tokamaks

PLASMA PHYSICS AND CONTROLLED FUSION 56 (2014) ARTN 095014

J Ball, FI Parra, M Barnes, W Dorland, GW Hammett, P Rodrigues, NF Loureiro


Electron-ion equilibration in ultrafast heated graphite.

Physical review letters 112 (2014) 145005-

TG White, NJ Hartley, B Borm, BJ Crowley, JW Harris, DC Hochhaus, T Kaempfer, K Li, P Neumayer, LK Pattison, F Pfeifer, S Richardson, AP Robinson, I Uschmann, G Gregori

We have employed fast electrons produced by intense laser illumination to isochorically heat thermal electrons in solid density carbon to temperatures of ∼10,000  K. Using time-resolved x-ray diffraction, the temperature evolution of the lattice ions is obtained through the Debye-Waller effect, and this directly relates to the electron-ion equilibration rate. This is shown to be considerably lower than predicted from ideal plasma models. We attribute this to strong ion coupling screening the electron-ion interaction.


Energy Reconstruction Methods in the IceCube Neutrino Telescope

ArXiv (2013)

I Collaboration, MG Aartsen, R Abbasi, M Ackermann, J Adams, JA Aguilar, M Ahlers, D Altmann, C Arguelles, J Auffenberg, X Bai, M Baker, SW Barwick, V Baum, R Bay, JJ Beatty, JB Tjus, KH Becker, S BenZvi, P Berghaus, D Berley, E Bernardini, A Bernhard, DZ Besson, G Binder, D Bindig, M Bissok, E Blaufuss, J Blumenthal, DJ Boersma, C Bohm, D Bose, S Böser, O Botner, L Brayeur, HP Bretz, AM Brown, R Bruijn, J Casey, M Casier, D Chirkin, A Christov, B Christy, K Clark, L Classen, F Clevermann, S Coenders, S Cohen, DF Cowen, AHC Silva, M Danninger, J Daughhetee, JC Davis, M Day, CD Clercq, SD Ridder, P Desiati, KDD Vries, MD With, T DeYoung, JCD' iaz-Vélez, M Dunkman, R Eagan, B Eberhardt, B Eichmann, J Eisch, S Euler, PA Evenson, O Fadiran, AR Fazely, A Fedynitch, J Feintzeig, T Feusels, K Filimonov, C Finley, T Fischer-Wasels, S Flis, A Franckowiak, K Frantzen, T Fuchs, TK Gaisser, J Gallagher, L Gerhardt, L Gladstone, T Glüsenkamp, A Goldschmidt, G Golup, JG Gonzalez, JA Goodman, D Góra, DT Grandmont, D Grant, P Gretskov, JC Groh, A Groß, C Ha, AH Ismail, P Hallen, A Hallgren, F Halzen, K Hanson, D Hebecker, D Heereman, D Heinen, K Helbing, R Hellauer, S Hickford, GC Hill, KD Hoffman, R Hoffmann, A Homeier, K Hoshina, F Huang, W Huelsnitz, PO Hulth, K Hultqvist, S Hussain, A Ishihara, S Jackson, E Jacobi, J Jacobsen, K Jagielski, GS Japaridze, K Jero, O Jlelati, B Kaminsky, A Kappes, T Karg, A Karle, M Kauer, JL Kelley, J Kiryluk, J Kläs, SR Klein, JH Köhne, G Kohnen, H Kolanoski, L Köpke, C Kopper, S Kopper, DJ Koskinen, M Kowalski, M Krasberg, A Kriesten, K Krings, G Kroll, J Kunnen, N Kurahashi, T Kuwabara, M Labare, H Landsman, MJ Larson, M Lesiak-Bzdak, M Leuermann, J Leute, J Lünemann, O Macías, J Madsen, G Maggi, R Maruyama, K Mase, HS Matis, F McNally, K Meagher, M Merck, T Meures, S Miarecki, E Middell, N Milke, J Miller, L Mohrmann, T Montaruli, R Morse, R Nahnhauer, U Naumann, H Niederhausen, SC Nowicki, DR Nygren, A Obertacke, S Odrowski, A Olivas, A Omairat, A O'Murchadha, L Paul, JA Pepper, CPDL Heros, C Pfendner, D Pieloth, E Pinat, J Posselt, PB Price, GT Przybylski, M Quinnan, L Rädel, M Rameez, K Rawlins, P Redl, R Reimann, E Resconi, W Rhode, M Ribordy, M Richman, B Riedel, S Robertson, JP Rodrigues, C Rott, T Ruhe, B Ruzybayev, D Ryckbosch, SM Saba, HG Sander, M Santander, S Sarkar, K Schatto, F Scheriau, T Schmidt, M Schmitz, S Schoenen, S Schöneberg, A Schönwald, A Schukraft, L Schulte, O Schulz, D Seckel, Y Sestayo, S Seunarine, R Shanidze, C Sheremata, MWE Smith, D Soldin, GM Spiczak, C Spiering, M Stamatikos, T Stanev, NA Stanisha, A Stasik, T Stezelberger, RG Stokstad, A Stößl, EA Strahler, R Ström, NL Strotjohann, GW Sullivan, H Taavola, I Taboada, A Tamburro, A Tepe, S Ter-Antonyan, G Tešić, S Tilav, PA Toale, MN Tobin, S Toscano, M Tselengidou, E Unger, M Usner, S Vallecorsa, NV Eijndhoven, AV Overloop, JV Santen, M Vehring, M Voge, M Vraeghe, C Walck, T Waldenmaier, M Wallraff, C Weaver, M Wellons, C Wendt, S Westerhoff, B Whelan, N Whitehorn, K Wiebe, CH Wiebusch, DR Williams, H Wissing, M Wolf, TR Wood, K Woschnagg, DL Xu, XW Xu, JP Yanez, G Yodh, S Yoshida, P Zarzhitsky, J Ziemann, S Zierke, M Zoll

Accurate measurement of neutrino energies is essential to many of the scientific goals of large-volume neutrino telescopes. The fundamental observable in such detectors is the Cherenkov light produced by the transit through a medium of charged particles created in neutrino interactions. The amount of light emitted is proportional to the deposited energy, which is approximately equal to the neutrino energy for $\nu_e$ and $\nu_\mu$ charged-current interactions and can be used to set a lower bound on neutrino energies and to measure neutrino spectra statistically in other channels. Here we describe methods and performance of reconstructing charged-particle energies and topologies from the observed Cherenkov light yield, including techniques to measure the energies of uncontained muon tracks, achieving average uncertainties in electromagnetic-equivalent deposited energy of $\sim 15\%$ above 10 TeV.


AMS-02 data confronts acceleration of cosmic ray secondaries in nearby sources

ArXiv (2014)

P Mertsch, S Sarkar

We revisit the model proposed earlier to account for the observed increase in the positron fraction in cosmic rays with increasing energy, in the light of new data from the Alpha Magnetic Spectrometer (AMS-02) experiment. The model accounts for the production and acceleration of secondary electrons and positrons in nearby supernova remnants which results in an additional, harder component that becomes dominant at high energies. By fitting this to AMS-02 data we can calculate the expected concomitant rise of the boron-to-carbon ratio, as well as of the fraction of antiprotons. If these predictions are confirmed by the forthcoming AMS-02 data it would conclusively rule out all other proposed explanations, in particular dark matter annihilations or decays.


Synchrotron radiation, pair production, and longitudinal electron motion during 10-100 PW laser solid interactions

PHYSICS OF PLASMAS 21 (2014) ARTN 033108

CS Brady, CP Ridgers, TD Arber, AR Bell


Dancing in the dark: galactic properties trace spin swings along the cosmic web

ArXiv (2014)

Y Dubois, C Pichon, C Welker, DL Borgne, J Devriendt, C Laigle, S Codis, D Pogosyan, S Arnouts, K Benabed, E Bertin, J Blaizot, F Bouchet, JF Cardoso, S Colombi, VD Lapparent, V Desjacques, R Gavazzi, S Kassin, T Kimm, H McCracken, B Milliard, S Peirani, S Prunet, S Rouberol, J Silk, A Slyz, T Sousbie, R Teyssier, L Tresse, M Treyer, D Vibert, M Volonteri

A large-scale hydrodynamical cosmological simulation, Horizon-AGN, is used to investigate the alignment between the spin of galaxies and the cosmic filaments above redshift 1.2. The analysis of more than 150 000 galaxies per time step in the redshift range 1.2<z<1.8 with morphological diversity shows that the spin of low-mass blue galaxies is preferentially aligned with their neighbouring filaments, while high-mass red galaxies tend to have a perpendicular spin. The reorientation of the spin of massive galaxies is provided by galaxy mergers, which are significant in their mass build-up. We find that the stellar mass transition from alignment to misalignment happens around 3.10^10 M_sun. Galaxies form in the vorticity-rich neighbourhood of filaments, and migrate towards the nodes of the cosmic web as they convert their orbital angular momentum into spin. The signature of this process can be traced to the properties of galaxies, as measured relative to the cosmic web. We argue that a strong source of feedback such as active galactic nuclei is mandatory to quench in situ star formation in massive galaxies and promote various morphologies. It allows mergers to play their key role by reducing post-merger gas inflows and, therefore, keeping spins misaligned with cosmic filaments.


Development of a General Analysis and Unfolding Scheme and its Application to Measure the Energy Spectrum of Atmospheric Neutrinos with IceCube

ArXiv (2014)

MG Aartsen, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, D Altmann, T Anderson, C Arguelles, TC Arlen, J Auffenberg, X Bai, SW Barwick, V Baum, JJ Beatty, JB Tjus, KH Becker, S BenZvi, P Berghaus, D Berley, E Bernardini, A Bernhard, DZ Besson, G Binder, D Bindig, M Bissok, E Blaufuss, J Blumenthal, DJ Boersma, C Bohm, F Bos, D Bose, S Böser, O Botner, L Brayeur, HP Bretz, AM Brown, J Casey, M Casier, E Cheung, D Chirkin, A Christov, B Christy, K Clark, L Classen, F Clevermann, S Coenders, DF Cowen, AHC Silva, M Danninger, J Daughhetee, JC Davis, M Day, JPAM deAndré, CD Clercq, SD Ridder, P Desiati, KDD Vries, MD With, T DeYoung, JC Díaz-Vélez, M Dunkman, R Eagan, B Eberhardt, B Eichmann, J Eisch, S Euler, PA Evenson, O Fadiran, AR Fazely, A Fedynitch, J Feintzeig, J Felde, T Feusels, K Filimonov, C Finley, T Fischer-Wasels, S Flis, A Franckowiak, K Frantzen, T Fuchs, TK Gaisser, R Gaior, J Gallagher, L Gerhardt, D Gier, L Gladstone, T Glüsenkamp, A Goldschmidt, G Golup, JG Gonzalez, JA Goodman, D Góra, D Grant, P Gretskov, JC Groh, A Groß, C Ha, C Haack, AH Ismail, P Hallen, A Hallgren, F Halzen, K Hanson, D Hebecker, D Heereman, D Heinen, K Helbing, R Hellauer, D Hellwig, S Hickford, GC Hill, KD Hoffman, R Hoffmann, A Homeier, K Hoshina, F Huang, W Huelsnitz, PO Hulth, K Hultqvist, S Hussain, A Ishihara, E Jacobi, J Jacobsen, K Jagielski, GS Japaridze, K Jero, O Jlelati, M Jurkovic, B Kaminsky, A Kappes, T Karg, A Karle, M Kauer, A Keivani, JL Kelley, A Kheirandish, J Kiryluk, J Kläs, SR Klein, JH Köhne, G Kohnen, H Kolanoski, A Koob, L Köpke, C Kopper, S Kopper, DJ Koskinen, M Kowalski, A Kriesten, K Krings, G Kroll, M Kroll, J Kunnen, N Kurahashi, T Kuwabara, M Labare, DT Larsen, MJ Larson, M Lesiak-Bzdak, M Leuermann, J Leute, J Lünemann, J Madsen, G Maggi, R Maruyama, K Mase, HS Matis, R Maunu, F McNally, K Meagher, M Medici, A Meli, T Meures, S Miarecki, E Middell, E Middlemas, N Milke, J Miller, L Mohrmann, T Montaruli, R Morse, R Nahnhauer, U Naumann, H Niederhausen, SC Nowicki, DR Nygren, A Obertacke, S Odrowski, A Olivas, A Omairat, A O'Murchadha, T Palczewski, L Paul, Ö Penek, JA Pepper, CPDL Heros, C Pfendner, D Pieloth, E Pinat, J Posselt, PB Price, GT Przybylski, J Pütz, M Quinnan, L Rädel, M Rameez, K Rawlins, P Redl, I Rees, R Reimann, M Relich, E Resconi, W Rhode, M Richman, B Riedel, S Robertson, JP Rodrigues, M Rongen, C Rott, T Ruhe, B Ruzybayev, D Ryckbosch, SM Saba, HG Sander, J Sandroos, M Santander, S Sarkar, K Schatto, F Scheriau, T Schmidt, M Schmitz, S Schoenen, S Schöneberg, A Schönwald, A Schukraft, L Schulte, O Schulz, D Seckel, Y Sestayo, S Seunarine, R Shanidze, MWE Smith, D Soldin, GM Spiczak, C Spiering, M Stamatikos, T Stanev, NA Stanisha, A Stasik, T Stezelberger, RG Stokstad, A Stößl, EA Strahler, R Ström, NL Strotjohann, GW Sullivan, H Taavola, I Taboada, A Tamburro, A Tepe, S Ter-Antonyan, A Terliuk, G Tešić, S Tilav, PA Toale, MN Tobin, D Tosi, M Tselengidou, E Unger, M Usner, S Vallecorsa, NV Eijndhoven, J Vandenbroucke, JV Santen, M Vehring, M Voge, M Vraeghe, C Walck, M Wallraff, C Weaver, M Wellons, C Wendt, S Westerhoff, BJ Whelan, N Whitehorn, C Wichary, K Wiebe, CH Wiebusch, DR Williams, H Wissing, M Wolf, TR Wood, K Woschnagg, DL Xu, XW Xu, JP Yanez, G Yodh, S Yoshida, P Zarzhitsky, J Ziemann, S Zierke, M Zoll, K Morik

We present the development and application of a generic analysis scheme for the measurement of neutrino spectra with the IceCube detector. This scheme is based on regularized unfolding, preceded by an event selection which uses a Minimum Redundancy Maximum Relevance algorithm to select the relevant variables and a Random Forest as a classifier. The analysis has been developed using IceCube data from the 59-string configuration of the detector. 27,771 neutrino candidates were detected in 346 days of livetime. A rejection of 99.9999 % of the atmospheric muon background is achieved. The energy spectrum of the atmospheric neutrino flux is obtained using the TRUEE unfolding program. The unfolded spectrum of atmospheric muon neutrinos covers an energy range from 100 GeV to 1 PeV. Compared to the previous measurement using the detector in the 40-string configuration, the analysis presented here, extends the upper end of the atmospheric neutrino spectrum by more than a factor of two, reaching an energy region that has not been previously accessed by spectral measurements.


Intrinsic rotation in tokamaks. Theory

ArXiv (2014)

FI Parra, M Barnes

Self-consistent equations for intrinsic rotation in tokamaks with small poloidal magnetic field $B_p$ compared to the total magnetic field $B$ are derived. The model gives the momentum redistribution due to turbulence, collisional transport and energy injection. Intrinsic rotation is determined by the balance between the momentum redistribution and the turbulent diffusion and convection. Two different turbulence regimes are considered: turbulence with characteristic perpendicular lengths of the order of the ion gyroradius, $\rho_i$, and turbulence with characteristic lengths of the order of the poloidal gyroradius, $(B/B_p) \rho_i$. Intrinsic rotation driven by gyroradius scale turbulence is mainly due to the effect of neoclassical corrections and of finite orbit widths on turbulent momentum transport, whereas for the intrinsic rotation driven by poloidal gyroradius scale turbulence, the slow variation of turbulence characteristics in the radial and poloidal directions and the turbulent particle acceleration can be become as important as the neoclassical and finite orbit width effects. The magnetic drift is shown to be indispensable for the intrinsic rotation driven by the slow variation of turbulence characteristics and the turbulent particle acceleration. The equations are written in a form easily implementable in a flux tube code, and the effect of the radial variation of the turbulence is included without having to resort to a global gyrokinetic formalism.


The RAVE survey: the Galactic escape speed and the mass of the Milky Way

ASTRONOMY & ASTROPHYSICS 562 (2014) ARTN A91

T Piffl, C Scannapieco, J Binney, M Steinmetz, R-D Scholz, MEK Williams, RS de Jong, G Kordopatis, G Matijevic, O Bienayme, J Bland-Hawthorn, C Boeche, K Freeman, B Gibson, G Gilmore, EK Grebel, A Helmi, U Munari, JF Navarro, Q Parker, WA Reid, G Seabroke, F Watson, RFG Wyse, T Zwitter


Multimessenger search for sources of gravitational waves and high-energy neutrinos: Initial results for LIGO-Virgo and IceCube

PHYSICAL REVIEW D 90 (2014) UNSP 102002

MG Aartsen, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, D Altmann, T Anderson, C Arguelles, TC Arlen, J Auffenberg, X Bai, SW Barwick, V Baum, JJ Beatty, JB Tjus, K-H Becker, S BenZvi, P Berghaus, D Berley, E Bernardini, A Bernhard, DZ Besson, G Binder, D Bindig, M Bissok, E Blaufuss, J Blumenthal, DJ Boersma, C Bohm, F Bos, D Bose, S Boeser, O Botner, L Brayeur, H-P Bretz, AM Brown, J Casey, M Casier, D Chirkin, A Christov, B Christy, K Clark, L Classen, F Clevermann, S Coenders, DF Cowen, AHC Silva, M Danninger, J Daughhetee, JC Davis, M Day, JPAM de Andre, C De Clercq, S De Ridder, P Desiati, KD de Vries, M de With, T DeYoung, JC Diaz-Velez, M Dunkman, R Eagan, B Eberhardt, B Eichmann, J Eisch, S Euler, PA Evenson, O Fadiran, AR Fazely, A Fedynitch, J Feintzeig, J Felde, T Feusels, K Filimonov, C Finley, T Fischer-Wasels, S Flis, A Franckowiak, K Frantzen, T Fuchs, TK Gaisser, J Gallagher, L Gerhardt, D Gier, L Gladstone, T Gluesenkamp, A Goldschmidt, G Golup, JG Gonzalez, JA Goodman, D Gora, DT Grandmont, D Grant, P Gretskov, JC Groh, A Gross, C Ha, C Haack, AH Ismail, P Hallen, A Hallgren, F Halzen, K Hanson, D Hebecker, D Heereman, D Heinen, K Helbing, R Hellauer, D Hellwig, S Hickford, GC Hill, KD Hoffman, R Hoffmann, A Homeier, K Hoshina, F Huang, W Huelsnitz, PO Hulth, K Hultqvist, S Hussain, A Ishihara, E Jacobi, J Jacobsen, K Jagielski, GS Japaridze, K Jero, O Jlelati, M Jurkovic, B Kaminsky, A Kappes, T Karg, A Karle, M Kauer, JL Kelley, A Kheirandish, J Kiryluk, J Klaes, SR Klein, J-H Koehne, G Kohnen, H Kolanoski, A Koob, L Koepke, C Kopper, S Kopper, DJ Koskinen, M Kowalski, A Kriesten, K Krings, G Kroll, M Kroll, J Kunnen, N Kurahashi, T Kuwabara, M Labare, DT Larsen, MJ Larson, M Lesiak-Bzdak, M Leuermann, J Leute, J Luenemann, O Macias, J Madsen, G Maggi, R Maruyama, K Mase, HS Matis, F McNally, K Meagher, M Medici, A Meli, T Meures, S Miarecki, E Middell, E Middlemas, N Milke, J Miller, L Mohrmann, T Montaruli, R Morse, R Nahnhauer, U Naumann, H Niederhausen, SC Nowicki, DR Nygren, A Obertacke, S Odrowski, A Olivas, A Omairat, A O'Murchadha, T Palczewski, L Paul, O Penek, JA Pepper, CP de los Heros, C Pfendner, D Pieloth, E Pinat, J Posselt, PB Price, GT Przybylski, J Puetz, M Quinnan, L Raedel, M Rameez, K Rawlins, P Redl, I Rees, R Reimann, E Resconi, W Rhode, M Richman, B Riedel, S Robertson, JP Rodrigues, M Rongen, C Rott, T Ruhe, B Ruzybayev, D Ryckbosch, SM Saba, H-G Sander, J Sandroos, M Santander, S Sarkar, K Schatto, F Scheriau, T Schmidt, M Schmitz, S Schoenen, S Schoeneberg, A Schoenwald, A Schukraft, L Schulte, O Schulz, D Seckel, Y Sestayo, S Seunarine, R Shanidze, C Sheremata, MWE Smith, D Soldin, GM Spiczak, C Spiering, M Stamatikos, T Stanev, NA Stanisha, A Stasik, T Stezelberger, RG Stokstad, A Stoessl, EA Strahler, R Strom, NL Strotjohann, GW Sullivan, H Taavola, I Taboada, A Tamburro, A Tepe, S Ter-Antonyan, A Terliuk, G Tesic, S Tilav, PA Toale, MN Tobin, D Tosi, M Tselengidou, E Unger, M Usner, S Vallecorsa, N van Eijndhoven, J Vandenbroucke, J van Santen, M Vehring, M Voge, M Vraeghe, C Walck, M Wallraff, C Weaver, M Wellons, C Wendt, S Westerhoff, BJ Whelan, N Whitehorn, C Wichary, K Wiebe, CH Wiebusch, DR Williams, H Wissing, M Wolf, TR Wood, K Woschnagg, DL Xu, XW Xu, JP Yanez, G Yodh, S Yoshida, P Zarzhitsky, J Ziemann, S Zierke, M Zoll, J Aasi, BP Abbott, R Abbott, T Abbott, MR Abernathy, F Acernese, K Ackley, C Adams, T Adams, P Addesso, RX Adhikari, C Affeldt, M Agathos, N Aggarwal, OD Aguiar, P Ajith, A Alemic, B Allen, A Allocca, D Amariutei, M Andersen, RA Anderson, SB Anderson, WG Anderson, K Arai, MC Araya, C Arceneaux, JS Areeda, S Ast, SM Aston, P Astone, P Aufmuth, H Augustus, C Aulbert, BE Aylott, S Babak, PT Baker, G Ballardin, SW Ballmer, JC Barayoga, M Barbet, BC Barish, D Barker, F Barone, B Barr, L Barsotti, M Barsuglia, MA Barton, I Bartos, R Bassiri, A Basti, JC Batch, J Bauchrowitz, TS Bauer, C Baune, V Bavigadda, B Behnke, M Bejger, MG Beker, C Belczynski, AS Bell, C Bell, G Bergmann, D Bersanetti, A Bertolini, J Betzwieser, IA Bilenko, G Billingsley, J Birch, S Biscans, M Bitossi, C Biwer, MA Bizouard, E Black, JK Blackburn, L Blackburn, D Blair, S Bloemen, O Bock, TP Bodiya, M Boer, G Bogaert, C Bogan, P Bojtos, C Bond, F Bondu, L Bonelli, R Bonnand, R Bork, M Born, V Boschi, S Bose, L Bosi, C Bradaschia, PR Brady, VB Braginsky, M Branchesi, JE Brau, T Briant, DO Bridges, A Brillet, M Brinkmann, V Brisson, AF Brooks, DA Brown, DD Brown, F Brueckner, S Buchman, A Buikema, T Bulik, HJ Bulten, A Buonanno, R Burman, D Buskulic, C Buy, L Cadonati, G Cagnoli, J Calderon Bustillo, E Calloni, JB Camp, P Campsie, KC Cannon, B Canuel, J Cao, CD Capano, F Carbognani, L Carbone, S Caride, G Castaldi, S Caudill, M Cavaglia, F Cavalier, R Cavalieri, C Celerier, G Cella, C Cepeda, E Cesarini, R Chakraborty, T Chalermsongsak, SJ Chamberlin, S Chao, P Charlton, E Chassande-Mottin, X Chen, Y Chen, A Chincarini, A Chiummo, HS Cho, M Cho, JH Chow, N Christensen, Q Chu, SSY Chua, S Chung, G Ciani, F Clara, DE Clark, JA Clark, JH Clayton, F Cleva, E Coccia, P-F Cohadon, A Colla, C Collette, M Colombini, L Cominsky, CM Jr, A Conte, D Cook, TR Corbitt, N Cornish, A Corsi, CA Costa, MW Coughlin, J-P Coulon, S Countryman, P Couvares, DM Coward, MJ Cowart, DC Coyne, R Coyne, K Craig, JDE Creighton, RP Croce, SG Crowder, A Cumming, L Cunningham, E Cuoco, C Cutler, K Dahl, T Dal Canton, M Damjanic, SL Danilishin, S D'Antonio, K Danzmann, V Dattilo, H Daveloza, M Davier, GS Davies, EJ Daw, R Day, T Dayanga, D DeBra, G Debreczeni, J Degallaix, S Deleglise, W Del Pozzo, W Del Pozzo, T Denker, T Dent, H Dereli, V Dergachev, R De Rosa, RT DeRosa, R DeSalvo, S Dhurandhar, M Diaz, J Dickson, L Di Fiore, A Di Lieto, I Di Palma, A Di Virgilio, V Dolique, E Dominguez, F Donovan, KL Dooley, S Doravari, R Douglas, TP Downes, M Drago, RWP Drever, JC Driggers, Z Du, M Ducrot, S Dwyer, T Eberle, T Edo, M Edwards, A Effler, H-B Eggenstein, P Ehrens, J Eichholz, SS Eikenberry, G Endroczi, R Essick, T Etzel, M Evans, T Evans, M Factourovich, V Fafone, S Fairhurst, X Fan, Q Fang, S Farinon, B Farr, WM Farr, M Favata, D Fazi, H Fehrmann, MM Fejer, D Feldbaum, F Feroz, I Ferrante, EC Ferreira, F Ferrini, F Fidecaro, LS Finn, I Fiori, RP Fisher, R Flaminio, J-D Fournier, S Franco, S Frasca, F Frasconi, M Frede, Z Frei, A Freise, R Frey, TT Fricke, P Fritschel, VV Frolov, P Fulda, M Fyffe, JR Gair, L Gammaitoni, S Gaonkar, F Garufi, N Gehrels, G Gemme, B Gendre, E Genin, A Gennai, S Ghosh, JA Giaime, KD Giardina, A Giazotto, J Gleason, E Goetz, R Goetz, L Gondan, G Gonzalez, N Gordon, ML Gorodetsky, S Gossan, S Gossler, R Gouaty, C Graef, PB Graff, M Granata, A Grant, S Gras, C Gray, RJS Greenhalgh, AM Gretarsson, P Groot, H Grote, K Grover, S Grunewald, GM Guidi, CJ Guido, K Gushwa, EK Gustafson, R Gustafson, J Ha, ED Hall, W Hamilton, D Hammer, G Hammond, M Hanke, J Hanks, C Hanna, MD Hannam, J Hanson, J Harms, GM Harry, IW Harry, ED Harstad, M Hart, MT Hartman, C-J Haster, K Haughian, A Heidmann, M Heintze, H Heitmann, P Hello, G Hemming, M Hendry, IS Heng, AW Heptonstall, M Heurs, M Hewitson, S Hild, D Hoak, KA Hodge, D Hofman, K Holt, P Hopkins, T Horrom, D Hoske, DJ Hosken, J Hough, EJ Howell, Y Hu, E Huerta, B Hughey, S Husa, SH Huttner, M Huynh, T Huynh-Dinh, A Idrisy, DR Ingram, R Inta, G Islas, T Isogai, A Ivanov, BR Iyer, K Izumi, M Jacobson, H Jang, P Jaranowski, Y Ji, F Jimenez-Forteza, WW Johnson, DI Jones, R Jones, RJG Jonker, L Ju, K Haris, P Kalmus, V Kalogera, S Kandhasamy, G Kang, JB Kanner, J Karlen, M Kasprzack, E Katsavounidis, W Katzman, H Kaufer, S Kaufer, T Kaur, K Kawabe, F Kawazoe, F Kefelian, GM Keiser, D Keitel, DB Kelley, W Kells, DG Keppel, A Khalaidovski, FY Khalili, EA Khazanov, C Kim, K Kim, NG Kim, N Kim, S Kim, Y-M Kim, EJ King, PJ King, DL Kinzel, JS Kissel, S Klimenko, J Kline, S Koehlenbeck, K Kokeyama, V Kondrashov, S Koranda, WZ Korth, I Kowalska, DB Kozak, V Kringel, A Krolak, G Kuehn, A Kumar, DN Kumar, P Kumar, R Kumar, L Kuo, A Kutynia, PK Lam, M Landry, B Lantz, S Larson, PD Lasky, A Lazzarini, C Lazzaro, P Leaci, S Leavey, EO Lebigot, CH Lee, HK Lee, HM Lee, J Lee, PJ Lee, M Leonardi, JR Leong, A Le Roux, N Leroy, N Letendre, Y Levin, B Levine, J Lewis, TGF Li, K Libbrecht, A Libson, AC Lin, TB Littenberg, NA Lockerbie, V Lockett, D Lodhia, K Loew, J Logue, AL Lombardi, E Lopez, M Lorenzini, V Loriette, M Lormand, G Losurdo, J Lough, MJ Lubinski, H Lueck, AP Lundgren, Y Ma, EP Macdonald, T MacDonald, B Machenschalk, M MacInnis, DM Macleod, F Magana-Sandoval, R Magee, M Mageswaran, C Maglione, K Mailand, E Majorana, I Maksimovic, V Malvezzi, N Man, GM Manca, I Mandel, V Mandic, V Mangano, NM Mangini, G Mansell, M Mantovani, F Marchesoni, F Marion, S Marka, Z Marka, A Markosyan, E Maros, J Marque, F Martelli, IW Martin, RM Martin, L Martinelli, D Martynov, JN Marx, K Mason, A Masserot, TJ Massinger, F Matichard, L Matone, N Mavalvala, G May, N Mazumder, G Mazzolo, R McCarthy, DE McClelland, SC McGuire, G McIntyre, J McIver, K McLin, D Meacher, GD Meadors, M Mehmet, J Meidam, M Meinders, A Melatos, G Mendell, RA Mercer, S Meshkov, C Messenger, MS Meyer, PM Meyers, F Mezzani, H Miao, C Michel, EE Mikhailov, L Milano, J Miller, Y Minenkov, CMF Mingarelli, C Mishra, S Mitra, VP Mitrofanov, G Mitselmakher, R Mittleman, B Moe, A Moggi, M Mohan, SRP Mohapatra, D Moraru, G Moreno, N Morgado, SR Morriss, K Mossavi, B Mours, CM Mow-Lowry, CL Mueller, G Mueller, S Mukherjee, A Mullavey, J Munch, D Murphy, PG Murray, A Mytidis, MF Nagy, I Nardecchia, L Naticchioni, RK Nayak, V Necula, G Nelemans, I Neri, M Neri, G Newton, T Nguyen, AB Nielsen, S Nissanke, AH Nitz, F Nocera, D Nolting, MEN Normandin, LK Nuttall, E Ochsner, J O'Dell, E Oelker, JJ Oh, SH Oh, F Ohme, S Omar, P Oppermann, R Oram, B O'Reilly, W Ortega, R O'Shaughnessy, C Osthelder, DJ Ottaway, RS Ottens, H Overmier, BJ Owen, C Padilla, A Pai, O Palashov, C Palomba, H Pan, Y Pan, C Pankow, F Paoletti, MA Papa, H Paris, A Pasqualetti, R Passaquieti, D Passuello, M Pedraza, A Pele, S Penn, A Perreca, M Phelps, M Pichot, M Pickenpack, F Piergiovanni, V Pierro, L Pinard, IM Pinto, M Pitkin, J Poeld, R Poggiani, A Poteomkin, J Powell, J Prasad, V Predoi, S Premachandra, T Prestegard, LR Price, M Prijatelj, S Privitera, GA Prodi, L Prokhorov, O Puncken, M Punturo, P Puppo, M Puerrer, J Qin, V Quetschke, E Quintero, R Quitzow-James, FJ Raab, DS Rabeling, I Racz, H Radkins, P Raffai, S Raja, G Rajalakshmi, M Rakhmanov, C Ramet, K Ramirez, P Rapagnani, V Raymond, M Razzano, V Re, S Recchia, CM Reed, T Regimbau, S Reid, DH Reitze, O Reula, E Rhoades, F Ricci, R Riesen, K Riles, NA Robertson, F Robinet, A Rocchi, SB Roddy, L Rolland, JG Rollins, R Romano, G Romanov, JH Romie, D Rosinska, S Rowan, A Ruediger, P Ruggi, K Ryan, F Salemi, L Sammut, V Sandberg, JR Sanders, S Sankar, V Sannibale, I Santiago-Prieto, E Saracco, B Sassolas, BS Sathyaprakash, PR Saulson, R Savage, J Scheuer, R Schilling, M Schilman, P Schmidt, R Schnabel, RMS Schofield, E Schreiber, D Schuette, BF Schutz, J Scott, SM Scott, D Sellers, AS Sengupta, D Sentenac, V Sequino, A Sergeev, DA Shaddock, S Shah, MS Shahriar, M Shaltev, Z Shao, B Shapiro, P Shawhan, DH Shoemaker, TL Sidery, K Siellez, X Siemens, D Sigg, D Simakov, A Singer, L Singer, R Singh, AM Sintes, BJJ Slagmolen, J Slutsky, JR Smith, MR Smith, RJE Smith, ND Smith-Lefebvre, EJ Son, B Sorazu, T Souradeep, A Staley, J Stebbins, M Steinke, J Steinlechner, S Steinlechner, BC Stephens, S Steplewski, S Stevenson, R Stone, D Stops, KA Strain, N Straniero, S Strigin, R Sturani, AL Stuver, TZ Summerscales, S Susmithan, PJ Sutton, B Swinkels, M Tacca, D Talukder, DB Tanner, J Tao, SP Tarabrin, R Taylor, G Tellez, MP Thirugnanasambandam, M Thomas, P Thomas, KA Thorne, KS Thorne, E Thrane, V Tiwari, KV Tokmakov, C Tomlinson, M Tonelli, CV Torres, CI Torrie, F Travasso, G Traylor, M Tse, D Tshilumba, H Tuennermann, D Ugolini, CS Unnikrishnan, AL Urban, SA Usman, H Vahlbruch, G Vajente, G Valdes, M Vallisneri, M van Beuzekom, JFJ van den Brand, C Van Den Broeck, MV van der Sluys, J van Heijningen, AA van Veggel, S Vass, M Vasuth, R Vaulin, A Vecchio, G Vedovato, J Veitch, PJ Veitch, K Venkateswara, D Verkindt, F Vetrano, A Vicere, R Vincent-Finley, J-Y Vinet, S Vitale, T Vo, H Vocca, C Vorvick, WD Vousden, SP Vyachanin, AR Wade, L Wade, M Wade, M Walker, L Wallace, S Walsh, M Wang, X Wang, RL Ward, M Was, B Weaver, L-W Wei, M Weinert, AJ Weinstein, R Weiss, T Welborn, L Wen, P Wessels, M West, T Westphal, K Wette, JT Whelan, DJ White, BF Whiting, K Wiesner, C Wilkinson, K Williams, L Williams, R Williams, TD Williams, AR Williamson, JL Willis, B Willke, M Wimmer, W Winkler, CC Wipf, AG Wiseman, H Wittel, G Woan, N Wolovick, J Worden, Y Wu, J Yablon, I Yakushin, W Yam, H Yamamoto, CC Yancey, H Yang, S Yoshida, M Yvert, A Zadrozny, M Zanolin, J-P Zendri, F Zhang, L Zhang, C Zhao, H Zhu, XJ Zhu, ME Zucker, S Zuraw, J Zweizig, I Collaboration, LIGOSCV Colla


Dependence of intrinsic rotation on collisionality in MAST

ArXiv (2014)

JC Hillesheim, FI Parra, M Barnes, NA Crocker, H Meyer, WA Peebles, R Scannell, A Thornton, TMAST Team

Tokamak plasmas rotate even without any external injection of momentum. A Doppler backscattering system installed at MAST has allowed this intrinsic rotation to be studied in Ohmic L-mode and H-mode plasmas, including the first observation of intrinsic rotation reversals in a spherical tokamak. Experimental results are compared to a novel 1D model, which captures the collisionality dependence of the radial transport of toroidal angular momentum due to finite drift orbit effects on turbulent fluctuations. The model is able to accurately reproduce the change in sign of core toroidal rotation, using experimental density and temperature profiles from shots with rotation reversals as inputs and no free parameters fit to experimental data.


Exploring Mbar shock conditions and isochorically heated aluminum at the Matter in Extreme Conditions end station of the Linac Coherent Light Source (invited).

The Review of scientific instruments 85 (2014) 11E702-

LB Fletcher, HJ Lee, B Barbrel, M Gauthier, E Galtier, B Nagler, T Döppner, S LePape, T Ma, A Pak, D Turnbull, T White, G Gregori, M Wei, RW Falcone, P Heimann, U Zastrau, JB Hastings, SH Glenzer

Recent experiments performed at the Matter in Extreme Conditions end station of the Linac Coherent Light Source (LCLS) have demonstrated the first spectrally resolved measurements of plasmons from isochorically heated aluminum. The experiments have been performed using a seeded 8-keV x-ray laser beam as a pump and probe to both volumetrically heat and scatter x-rays from aluminum. Collective x-ray Thomson scattering spectra show a well-resolved plasmon feature that is down-shifted in energy by 19 eV. In addition, Mbar shock pressures from laser-compressed aluminum foils using velocity interferometer system for any reflector have been measured. The combination of experiments fully demonstrates the possibility to perform warm dense matter studies at the LCLS with unprecedented accuracy and precision.


Nanosecond Imaging of Shock- and Jet-Like Features

IEEE TRANSACTIONS ON PLASMA SCIENCE 42 (2014) 2496-2497

ER Tubman, R Crowston, R Alraddadi, HW Doyle, J Meinecke, JE Cross, R Bolis, D Lamb, P Tzeferacos, D Doria, B Reville, H Ahmed, M Borghesi, G Gregori, NC Woolsey


High energy conversion efficiency in laser-proton acceleration by controlling laser-energy deposition onto thin foil targets

Applied Physics Letters American Institute of Physics Inc. 104 (2014)

CM Brenner, APL Robinson, K Markey, RHH Scott, RJ Gray, M Rosinski, O Deppert, J Badziak, D Batani, JR Davies, SM Hassan, KL Lancaster, K Li, IO Musgrave, PA Norreys, J Pasley, M Roth, H-P Schlenvoigt, C Spindloe, M Tatarakis, T Winstone, J Wolowski, D Wyatt, P McKenna, D Neely

An all-optical approach to laser-proton acceleration enhancement is investigated using the simplest of target designs to demonstrate application-relevant levels of energy conversion efficiency between laser and protons. Controlled deposition of laser energy, in the form of a double-pulse temporal envelope, is investigated in combination with thin foil targets in which recirculation of laser-accelerated electrons can lead to optimal conditions for coupling laser drive energy into the proton beam. This approach is shown to deliver a substantial enhancement in the coupling of laser energy to 5-30 MeV protons, compared to single pulse irradiation, reaching a record high 15% conversion efficiency with a temporal separation of 1 ps between the two pulses and a 5 μm-thick Au foil. A 1D simulation code is used to support and explain the origin of the observation of an optimum pulse separation of ∼1 ps. © 2014 Author(s).


Determining neutrino oscillation parameters from atmospheric muon neutrino disappearance with three years of IceCube DeepCore data

ArXiv (2014)

I Collaboration, MG Aartsen, M Ackermann, J Adams, JA Aguilar, M Ahlers, M Ahrens, D Altmann, T Anderson, C Arguelles, TC Arlen, J Auffenberg, X Bai, SW Barwick, V Baum, R Bay, JJ Beatty, JB Tjus, KH Becker, S BenZvi, P Berghaus, D Berley, E Bernardini, A Bernhard, DZ Besson, G Binder, D Bindig, M Bissok, E Blaufuss, J Blumenthal, DJ Boersma, C Bohm, F Bos, D Bose, S Böser, O Botner, L Brayeur, HP Bretz, AM Brown, J Brunner, N Buzinsky, J Casey, M Casier, E Cheung, D Chirkin, A Christov, B Christy, K Clark, L Classen, F Clevermann, S Coenders, DF Cowen, AHC Silva, J Daughhetee, JC Davis, M Day, JPAMD André, CD Clercq, SD Ridder, P Desiati, KDD Vries, MD With, T DeYoung, JC Díaz-Vélez, M Dunkman, R Eagan, B Eberhardt, B Eichmann, J Eisch, S Euler, PA Evenson, O Fadiran, AR Fazely, A Fedynitch, J Feintzeig, J Felde, T Feusels, K Filimonov, C Finley, T Fischer-Wasels, S Flis, A Franckowiak, K Frantzen, T Fuchs, TK Gaisser, R Gaior, J Gallagher, L Gerhardt, D Gier, L Gladstone, T Glüsenkamp, A Goldschmidt, G Golup, JG Gonzalez, JA Goodman, D Góra, D Grant, P Gretskov, JC Groh, A Groß, C Ha, C Haack, AH Ismail, P Hallen, A Hallgren, F Halzen, K Hanson, D Hebecker, D Heereman, D Heinen, K Helbing, R Hellauer, D Hellwig, S Hickford, GC Hill, KD Hoffman, R Hoffmann, A Homeier, K Hoshina, F Huang, W Huelsnitz, PO Hulth, K Hultqvist, S Hussain, A Ishihara, E Jacobi, J Jacobsen, GS Japaridze, K Jero, O Jlelati, M Jurkovic, B Kaminsky, A Kappes, T Karg, A Karle, M Kauer, A Keivani, JL Kelley, A Kheirandish, J Kiryluk, J Kläs, SR Klein, JH Köhne, G Kohnen, H Kolanoski, A Koob, L Köpke, C Kopper, S Kopper, DJ Koskinen, M Kowalski, A Kriesten, K Krings, G Kroll, M Kroll, J Kunnen, N Kurahashi, T Kuwabara, M Labare, JL Lanfranchi, DT Larsen, MJ Larson, M Lesiak-Bzdak, M Leuermann, J Lünemann, J Madsen, G Maggi, R Maruyama, K Mase, HS Matis, R Maunu, F McNally, K Meagher, M Medici, A Meli, T Meures, S Miarecki, E Middell, E Middlemas, N Milke, J Miller, L Mohrmann, T Montaruli, R Morse, R Nahnhauer, U Naumann, H Niederhausen, SC Nowicki, DR Nygren, A Obertacke, S Odrowski, A Olivas, A Omairat, A O'Murchadha, T Palczewski, L Paul, Ö Penek, JA Pepper, CPDL Heros, C Pfendner, D Pieloth, E Pinat, J Posselt, PB Price, GT Przybylski, J Pütz, M Quinnan, L Rädel, M Rameez, K Rawlins, P Redl, I Rees, R Reimann, M Relich, E Resconi, W Rhode, M Richman, B Riedel, S Robertson, JP Rodrigues, M Rongen, C Rott, T Ruhe, B Ruzybayev, D Ryckbosch, SM Saba, HG Sander, J Sandroos, M Santander, S Sarkar, K Schatto, F Scheriau, T Schmidt, M Schmitz, S Schoenen, S Schöneberg, A Schönwald, A Schukraft, L Schulte, O Schulz, D Seckel, Y Sestayo, S Seunarine, R Shanidze, MWE Smith, D Soldin, GM Spiczak, C Spiering, M Stamatikos, T Stanev, NA Stanisha, A Stasik, T Stezelberger, RG Stokstad, A Stößl, EA Strahler, R Ström, NL Strotjohann, GW Sullivan, H Taavola, I Taboada, A Tamburro, A Tepe, S Ter-Antonyan, A Terliuk, G Tešić, S Tilav, PA Toale, MN Tobin, D Tosi, M Tselengidou, E Unger, M Usner, S Vallecorsa, NV Eijndhoven, J Vandenbroucke, JV Santen, M Vehring, M Voge, M Vraeghe, C Walck, M Wallraff, C Weaver, M Wellons, C Wendt, S Westerhoff, BJ Whelan, N Whitehorn, C Wichary, K Wiebe, CH Wiebusch, DR Williams, H Wissing, M Wolf, TR Wood, K Woschnagg, DL Xu, XW Xu, JP Yanez, G Yodh, S Yoshida, P Zarzhitsky, J Ziemann, M Zoll

We present a measurement of neutrino oscillations via atmospheric muon neutrino disappearance with three years of data of the completed IceCube neutrino detector. DeepCore, a region of denser instrumentation, enables the detection and reconstruction of atmospheric muon neutrinos between 10\,GeV and 100\,GeV, where a strong disappearance signal is expected. The detector volume surrounding DeepCore is used as a veto region to suppress the atmospheric muon background. Neutrino events are selected where the detected Cherenkov photons of the secondary particles minimally scatter, and the neutrino energy and arrival direction are reconstructed. Both variables are used to obtain the neutrino oscillation parameters from the data, with the best fit given by $\Delta m^2_{32}=2.72^{+0.19}_{-0.20}\times 10^{-3}\,\mathrm{eV}^2$ and $\sin^2\theta_{23} = 0.53^{+0.09}_{-0.12}$ (normal mass hierarchy assumed). The results are compatible and comparable in precision to those of dedicated oscillation experiments.


Laminar shocks in high power laser plasma interactions

Physics of Plasmas 21 (2014)

RA Cairns, R Bingham, P Norreys, R Trines

We propose a theory to describe laminar ion sound structures in a collisionless plasma. Reflection of a small fraction of the upstream ions converts the well known ion acoustic soliton into a structure with a steep potential gradient upstream and with downstream oscillations. The theory provides a simple interpretation of results dating back more than forty years but, more importantly, is shown to provide an explanation for recent observations on laser produced plasmas relevant to inertial fusion and to ion acceleration. © 2014 AIP Publishing LLC.


Actions, angles and frequencies for numerically integrated orbits

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 441 (2014) 3284-3295

JL Sanders, J Binney


Radially global $δf$ computation of neoclassical phenomena in a tokamak pedestal

ArXiv (2013)

M Landreman, FI Parra, PJ Catto, DR Ernst, I Pusztai

Conventional radially-local neoclassical calculations become inadequate if the radial gradient scale lengths of the H-mode pedestal become as small as the poloidal ion gyroradius. Here, we describe a radially global $\delta f$ continuum code that generalizes neoclassical calculations to allow stronger gradients. As with conventional neoclassical calculations, the formulation is time-independent and requires only the solution of a single sparse linear system. We demonstrate precise agreement with an asymptotic analytic solution of the radially global kinetic equation in the appropriate limits of aspect ratio and collisionality. This agreement depends crucially on accurate treatment of finite orbit width effects.


When omnigeneity fails

ArXiv (2014)

FI Parra, I Calvo, JL Velasco, JA Alonso

A generic non-symmetric magnetic field does not confine magnetized charged particles for long times due to secular magnetic drifts. Stellarator magnetic fields should be omnigeneous (that is, designed such that the secular drifts vanish), but perfect omnigeneity is technically impossible. There always are small deviations from omnigeneity that necessarily have large gradients. The amplification of the energy flux caused by a deviation of size $\epsilon$ is calculated and it is shown that the scaling with $\epsilon$ of the amplification factor can be as large as linear. In opposition to common wisdom, most of the transport is not due to particles trapped in ripple wells, but to the perturbed motion of particles trapped in the omnigeneous magnetic wells around their bounce points.